As I heard that there's a new promo for season 7 on Discovery Family earlier. I'm not sure if one of the mane six was the voiceover in it. I was thinking that the voiceover for the promo would be Townsend Coleman since he haven't been doing promos on Discovery Family for a long time. The short and extended version of the promo were uploaded recently.
Update: a new MLP promo has uploaded recently. Watch the video for the promo. I am sure that the Hub Network announcer did the promo for it.